Suppose a statistics instructor wants to determine 1) if group study session are

Question

Suppose a statistics instructor wants to determine 1) if group study session are beneficial to students, and if so 2) whether or not the amount of time spent in group study makes a difference. Which of the following scenarios below refer to unbiased, controlled experiments that the instructor could run in order to answer one of these two research questions? For all of these scenarios, assume that the instructor is keeping track of the grades of all students in the class. Select all that apply. You have four tries, and you must pick only the correct scenarios for credit. Students are randomly assigned to four groups. Each group votes on how much studying they will do, and then studies that amount each week. Four groups are set up. Students in the first group are assigned to not study at all. Students in the second group are assigned to study on an individual basis. Students in the 3rd group are assigned to study 2 hours per week. Students in the 4th group are assigned to study 4 hours per week. Students then choose which group they want to be in. Students are randomly assigned to four study groups. The instructor assigns a different number of study hours to each group. The instructor puts all of the freshmen in the class into one group, all of the sophomores into another, all of the juniors into another, and finally all of the seniors into another. The instructor then randomly picks a certain number of hours for each group to study per week. Students are randomly assigned to two groups. One is assigned to only study on an individual basis, while the other is assigned to participate in group study sessions. Each student in the class keeps a log of the hours he/she spends studying in a group. Students report the total number of study hours after the course is completed.

Explanation / Answer

students are randomly assigned to two groups.

One is assigned to only study on an individual basis,

while the other is assigned to participate in grouo study sessions.

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